Cement-mold.



Patented Mar. 5, 1912.

ATTORNEYS (0.. WASHINGTON. n. c.

H. W. CLARK.

CEMENT MOLD.

APPLICATION FILED NOV.15, 1911.

WITNESSES %44/ COLUMBIA UNITED STATES PATENT OFFICE.

HORACE W. CLARK, OF MATTOON, ILLINOIS.

CEMENT-MOLD.

Specification of Letters Patent.

Application filed November 15, 1911.

Patented Mar. 5, 1912.

Serial No. 660,358.

To all whom it may concern:

Be it known that I, HORACE WV. CLARK, a citizen of the United States,and a resident of Mattoon, in the county of Coles and State of Illinois,have invented an Improvement in CementMolds, of which the following is aspecification.

My invention is an improvement in cement-molds of the collapsible type,such as are employed in constructing pipes, sewers, drains, columns, andthe like.

The invention is more particularly an improvement in the wedge type offastening l for the inner one of the two concentric molds usuallyemployed.

The details of construction, arrangement,-

part a vertical section illustrating my fastening as it appears beforetightening. Fig. 3 is an elevation of the same parts showing thefastening tightened. Fig. 4 is a horizontal section on the line 44 ofFig. 2. Fig. 5 is a perspective view illustrating the wedges proper,together with a portion of the key by which they may be operated.

The numeral 1 indicates the outer shell, and 2, the inner shell of acement mold.

These are arranged concentrically, and, in

I practice, iron blocks 3 are inserted between 1 them for holding themspaced apart, the cement being fed into the annular space whichseparates the two parts. The outer shell 1 has parallel flanges that lieflat together and are secured detachably by any suitable means. A woodenwedge-shaped block 3 (see Fig. 4) is placed between the flanges 4 andthe latter are drawn ti ht against it when the fasteners are properIyadjusted.

It is requisite to collapse the inner mold 2 in order to effect itsremoval after the cement has set in the required form. For

this purpose the section or shell 2 is split or divided longitudinallyand the adjacent edges 4 are turned inward and lie parallel as shown.

clamps 5 are formed of flat iron bars whose ends are bent at a rightangle and thus lie opposite and parallel to each other. The clamps areriveted at one end to the fixed wedge-bar 6 and their opposite endsoverlap the flange 4 of the mold 2 which is farthest removed from thewedge-bars. The wedge-bar 6 is provided at its inner side with wedges10, and the slidable wedgebar 7 is similarly provided on its outer sidewith wedges 11, which, in practice, work in contact with the wedges 10of the bar 6. The wedges are secured by screws to the respective bars,as illustrated in section in Fig. 2. The screw pins or bolts 8 passthrough slots 13 in the fixed wedge-bar 6 and enter the slidablewedge-bar 7. The spiral springs 9, before referred to, encircle theportions of the pins or bolts 12 which project beyond the fixedwedge-bar 6, the same being interposed between the heads of the pins andthe washer applied to the wedge-bar. It is apparent that by thisarrangement, if the wedge-bar 7 he slid up or down, the pins or bolts 12will move to a corresponding degree in the slots 13 of the wedge-bar 6.

In practice, when it is desired to draw the edges or flanges 4 of themold 2 toward each other, the bar 7 is driven downward by blows of ahammer applied to its head, so that its wedges 11 slide down on thewedges 10 of the fixed bar 6, thus crowding the two bars farther apart,as illustrated in Fig. 3. Thus the outer wedge-bar 6 to which the clamps5 are rigidly attached remains stationary during the operation justdescribed, and the other or inner slidable bar 7 is driven down in thespace between the bar 6 and the adjacent flange 4 of the mold section,the pins 12 moving with it as permitted by the slots 13. In order toeffect release of this engagement of the wedges and to adjust thesliclable bar 7 upward to the position indicated' in Fig. 2, one wedgeis provided on one side, adjacent to its plain surface, with acorrugated surface, as indicated at 10 and 11 in Fig. 5-see also Figs. 2and 3. When the wedges are juxtaposed, the two corrugated surfaces liepractically parallel and near each other, but without contact, and thespace between them permits the insertion of a key 14-see Figs. 4 and 5-whose working end is provided with longitudinal ribs and groovescorresponding to the corrugations -or teeth of the wedges.

Thus, by rotating the key, the wedges are moved longitudinally or causedto slide on each other as required for releasing them from lookingengagement. By adjustment of the movable Wedge-bar and its wedges bythis means, I avoid injury of the newlymade concrete form, which Wouldbe likely to occur by concussion and vibration if the Wedge-bar 7 weredriven upward and the wedges released by the blows of a hammer.

By the above described arrangement and combination of parts, I form afastening for a collapsible mold which may be easily and safely operatedand is highly effective for its purpose.

l/Vhat I claim is l. A clamping and fastening means for a longitudinallydivided cement mold, the same comprising parallel bars having wedgesarranged oppositely and adapted to slide on each other, guide pins fixedin the movable bar and passing through slots in the outer fixed bar,springs applied to the pins and bearing on the outer bar, and angularclamps secured to the outer bar and engaging the edge of the moldsection which is farthest removed from the wedge-bars, substantially asdescribed.

2. A clamping and fastening means for a longitudinally divided cementmold, the same applied thereto and consisting of parallel wedge-barsarranged in proximity and provided with a series of wedges adapted towork in slidable contact, the outer fixed bar having a series oflongitudinal slots, screwpins passing through said slots and inserted inthe inner or slidable bar, springs applied to the outer ends of thepins, and angular clamps secured to the outer wedge-bar and theiropposite ends engaging the cont1nu ous edge of the mold, substantiallyas described.

8. A clamping and fastening means for a longitudinally divided cementmold,\ the same comprising two parallel bars provided with oppositewedges arranged for slidable contact, one pair of the wedges beingconstructed with corrugated and inclined surfaces adjacent to theirplain inclined surfaces, the corrugations being adapted to receive arotatable key for adjusting the wedges on each other, guide pins securedto the inner wedge bar and projecting through the outer one, springsapplied to such pins, and angular clamps secured to the outer bar andengaging the farther edge of the mold, substantially as described.

A. The improved means for clamping and fastening a mold which is dividedlongitudinally, the same comprising two bars arranged parallel andprovided with opposite wedges adapted to work in contact, the outer barhaving a series of longitudinal slots and the inner bar having a seriesof pins Which pass through said slots and are provided with springspressing against the outer bar and angular clamps secured to the outerbar,

as shown and described.

HORACE W. CLARK. Witnesses:

J. A. RUE, DWIGHT P. CHILD.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents.

Washington, D. C."

